I have been working with Light Logic for over a year now and the name Light Logic fits quite well for the entire logic gate family ie. Not, And, Nand, Or etc....
What I have recently been looking into was a name for the Led/LDR pair and a few names have popped up such as....
NPV - Nesselhaus Photonic Valve @Starhawk
IPV - Isolated Photo Varistor @Starhawk
LLPT - Light Logic Photonic Transistor @Morning.Star
But @Yann Guidon / YGDES did some digging and came up with the Vactrol.
This opto-isolated buffer uses a Led coupled to a LDR in a very small package and the Vactrol name has been in use for quite a few years and used mainly in audio applications.
So in the end I will follow along and use the name Vactrol for my Led/LDR pair.